Hide Default Product Template field and set Category Template default


I’m trying to set the Category Template but it’s not working. I’ve set the Template in System Settings but when i right click the ‘Create A Simplecart Category Here’ it adopts the Shop Template.
I’ve tried adding the Tempate number into Manager Customization but this doesn’t work either.
What else can i do to set the default Category template?

I would also like to hide the Default Product Template field from the Category resource - how can i do this?

Thanks for any help